Alstermo is a locality situated in Uppvidinge Municipality, Kronoberg County, Sweden with 829 inhabitants in 2010.

Local government in the province Småland, belonging to Kronoberg County, with Växjö as capital city.

Elk, deer, fox, badger, marten, mink, and a host of other animals live in the dark woods surrounding Alstermo.

Alstermo has a doctor, a dentist, a post office, a bank, various stores, a youth hostel, restaurants, a library, a cinema and a recreation park.

Alstermo is the birthplace of the Swedish actress Siw Carlsson and Ulrika Bjorsne, a member of The Shortwave Set.